I have been throwing around the idea of getting one for over a year. I have done a lot of research and read numerous articles and reviews. I was set on an oregon 620-120. After doing more research, I found that tecomec makes the grinders for oregon. The tecomec super jolly is the comparable unit to what I was looking at. I also found that tecomec makes it for stens as well. The Oregon unit are selling for $370 to $400. After doing some reading, maverick mower supply has the stens model for $288 shipped. I ordered it and 3 days later it came in. I unpacked it and it is in a tecomec box with super jolly name on it. It's a legit machine. So if anyone is interested in one, the stens unit is $100 cheaper than the oregon and tecomec. I used yesterday evening for a bit after a day of ruining 4 chains(why people need to nail and put metal things on trees is beyond me), it works great. Lots of learning to do.